Verizon spokesman Trevor Thomas said the outages are in Kentucky, Indiana, Alabama and Tennessee and that engineers are working to resolve the problems.

The Lexington Herald-Leader said Sprint and T-Mobile customers also reported problems. The carriers posted Twitter messages saying they were working to fix the problems.The number of customers affected wasn’t available, and it’s not known when service might be restored.

WSMV-TV in Nashville, Tennessee, said outages were reported in Nashville, Chattanooga and Knoxville, Tennessee; Huntsville, Alabama; and Bowling Green, Lexington and Louisville, Kentucky.